GRAND RAPIDS, MICHIGAN -- Bought a Bissell 25A3, Don't bother.
I bought it because it heat up the water, a good sales pitch.
If you like filling and emptying the tank for every 4 square feet, then this is your model.
The carpet was so wet after using this carpet cleaner, I was worried about the floor boards warping.
The unit has one tank with a bladder in it, clean water and soap go into the bladder. My opinion is that as the bladder shrinks (clean water is put on the carpet)it impedes the suction of extracting the water out of the carpet.

Called customer service and the service representative was more interested in getting me off the phone than solving my problem.

Follow up: I had a Hoover carpet cleaner and used it on the same carpet a year earlier with better results. Much dryer than with the Bissell. I believe the Bissell left an unacceptable amount of water in and on the carpet